Gulp file for TypeScript

var gulp = require('gulp');
var sass = require('gulp-sass');
var sourcemaps = require('gulp-sourcemaps');
var handlebars = require('gulp-compile-handlebars');
var rename = require('gulp-rename');
var concat = require('gulp-concat');

var ts = require('gulp-typescript');

var buildDir = "build";
var jsDir = buildDir + "/js";
var compilerOptions = {
    "module": "commonjs",
    "target": "ES3",
    "noImplicitAny": true,
    "removeComments": true,
    "preserveConstEnums": true,
    "sortOutput ": true
};



gulp.task('typescript-compile', function(){
    var tsResult = gulp.src('TS/*.ts')
                       .pipe(sourcemaps.init()) // This means sourcemaps will be generated
                       .pipe(ts(compilerOptions));

    return tsResult.js
                .pipe(concat('weeklycal.js')) // You can use other plugins that also support gulp-sourcemaps
                .pipe(sourcemaps.write("./")) // Now the sourcemaps are added to the .js.map file
                .pipe(gulp.dest(jsDir));});

gulp.task('default',['typescript-compile']);